rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P3623/1:b..l P4461/1:b..l P4454/1:b..l P9/1:b..l
(detected by 0, t=10502 jiffies, g=9829, q=75 ncpus=2)
task:kworker/u4:0 state:R running task stack:23248 pid:9 ppid:2 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
irqentry_exit+0x63/0x70 kernel/entry/common.c:439
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:lock_acquire+0x20f/0x490 kernel/locking/lockdep.c:5666
Code: 00 9c 8f 84 24 80 00 00 00 f6 84 24 81 00 00 00 02 0f 85 f5 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 66 43 c7 44 3d 09 00 00 43 c6 44 3d 0b
RSP: 0018:ffffc900000e7ac0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: c4811e6f7bfa4e00
RDX: 0000000000000000 RSI: ffffffff8a6c1160 RDI: ffffffff8abf1360
RBP: ffffc900000e7bc8 R08: dffffc0000000000 R09: fffffbfff2117049
R10: fffffbfff2117049 R11: 1ffffffff2117048 R12: 0000000000000001
R13: 1ffff9200001cf64 R14: 0000000000000246 R15: dffffc0000000000
rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
rcu_read_lock include/linux/rcupdate.h:791 [inline]
batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
batadv_nc_worker+0xeb/0x600 net/batman-adv/network-coding.c:719
process_one_work+0x898/0x1160 kernel/workqueue.c:2292
worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
task:udevadm state:R running task stack:24352 pid:4454 ppid:4371 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
preempt_schedule_notrace+0xca/0x110 kernel/sched/core.c:6823
preempt_schedule_notrace_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35
rcu_is_watching+0x76/0xa0 kernel/rcu/tree.c:722
rcu_read_lock_held_common kernel/rcu/update.c:108 [inline]
rcu_read_lock_held+0x11/0x40 kernel/rcu/update.c:309
task_css include/linux/cgroup.h:509 [inline]
mem_cgroup_from_task+0x96/0x110 mm/memcontrol.c:985
get_obj_cgroup_from_current mm/memcontrol.c:3023 [inline]
__memcg_kmem_charge_page+0x185/0x380 mm/memcontrol.c:3123
__alloc_pages+0x215/0x4e0 mm/page_alloc.c:5631
__pte_alloc_one include/asm-generic/pgalloc.h:63 [inline]
pte_alloc_one+0x80/0x2f0 arch/x86/mm/pgtable.c:33
do_fault_around mm/memory.c:4595 [inline]
do_read_fault mm/memory.c:4626 [inline]
do_fault mm/memory.c:4760 [inline]
handle_pte_fault mm/memory.c:5031 [inline]
__handle_mm_fault mm/memory.c:5173 [inline]
handle_mm_fault+0x280a/0x3e70 mm/memory.c:5294
do_user_addr_fault+0x51f/0xb10 arch/x86/mm/fault.c:1340
handle_page_fault arch/x86/mm/fault.c:1431 [inline]
exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1487
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f0c816b3652
RSP: 002b:00007ffdb3a34110 EFLAGS: 00010283
RAX: 0000000000000046 RBX: 00007f0c815e9270 RCX: 000000000000000a
RDX: 00007f0c815e9040 RSI: 0000000000000006 RDI: 000000006fffffff
RBP: 00007ffdb3a34260 R08: 0000000000000006 R09: 00000000effffef5
R10: 0000000070000029 R11: 00007ffdb3a34348 R12: 0000000000000003
R13: 00007f0c816ab050 R14: 00007ffdb3a34300 R15: 00007f0c81602010
task:syz.3.25 state:R running task stack:26192 pid:4461 ppid:4260 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
preempt_schedule_irq+0xb1/0x150 kernel/sched/core.c:6873
irqentry_exit+0x63/0x70 kernel/entry/common.c:439
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:lock_acquire+0x20f/0x490 kernel/locking/lockdep.c:5666
Code: 00 9c 8f 84 24 80 00 00 00 f6 84 24 81 00 00 00 02 0f 85 f5 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 66 43 c7 44 3d 09 00 00 43 c6 44 3d 0b
RSP: 0000:ffffc9000524f280 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 60e9ffa516f18b00
RDX: 0000000000000000 RSI: ffffffff8a6c1160 RDI: ffffffff8abf1360
RBP: ffffc9000524f398 R08: dffffc0000000000 R09: fffffbfff2117049
R10: fffffbfff2117049 R11: 1ffffffff2117048 R12: 0000000000000001
R13: 1ffff92000a49e5c R14: 0000000000000246 R15: dffffc0000000000
rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
rcu_read_lock include/linux/rcupdate.h:791 [inline]
is_bpf_text_address+0x43/0x2a0 kernel/bpf/core.c:735
kernel_text_address+0x9c/0xd0 kernel/extable.c:125
__kernel_text_address+0x9/0x30 kernel/extable.c:79
unwind_get_return_address+0x49/0x80 arch/x86/kernel/unwind_orc.c:323
arch_stack_walk+0xf2/0x140 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0x98/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
kasan_save_free_info+0x2d/0x50 mm/kasan/generic.c:516
____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1724 [inline]
slab_free_freelist_hook+0x131/0x1a0 mm/slub.c:1750
slab_free mm/slub.c:3661 [inline]
kmem_cache_free+0xf7/0x290 mm/slub.c:3683
jbd2_free_handle include/linux/jbd2.h:1607 [inline]
jbd2_journal_stop+0x908/0xde0 fs/jbd2/transaction.c:1963
__ext4_journal_stop+0xf2/0x190 fs/ext4/ext4_jbd2.c:127
__mark_inode_dirty+0x322/0xf40 fs/fs-writeback.c:2433
generic_update_time fs/inode.c:1946 [inline]
inode_update_time fs/inode.c:1959 [inline]
__file_update_time+0x21d/0x240 fs/inode.c:2147
file_update_time+0x2d3/0x340 fs/inode.c:2178
ext4_page_mkwrite+0x19f/0x10c0 fs/ext4/inode.c:6236
do_page_mkwrite+0x16b/0x5c0 mm/memory.c:3011
do_shared_fault mm/memory.c:4696 [inline]
do_fault mm/memory.c:4764 [inline]
handle_pte_fault mm/memory.c:5031 [inline]
__handle_mm_fault mm/memory.c:5173 [inline]
handle_mm_fault+0x1b10/0x3e70 mm/memory.c:5294
do_user_addr_fault+0x51f/0xb10 arch/x86/mm/fault.c:1340
handle_page_fault arch/x86/mm/fault.c:1431 [inline]
exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1487
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7fdcc7a6ea07
RSP: 002b:00007ffec9cecc80 EFLAGS: 00010202
RAX: 0000001b2d920000 RBX: 00007fdcc88e5720 RCX: 0000001b2d520218
RDX: 0000001b2d91fffc RSI: 00000000003ffde8 RDI: 00007fdcc88e5700
RBP: 0000000000000000 R08: 00007fdcc7db6038 R09: 00007fdcc7da2000
R10: 00007fdcc88e5700 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 000000000000004e
task:udevd state:R running task stack:23040 pid:3623 ppid:1 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:6730
preempt_schedule+0xa7/0xb0 kernel/sched/core.c:6754
preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:34
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
_raw_spin_unlock_irqrestore+0xf6/0x100 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
__wake_up_common_lock kernel/sched/wait.c:140 [inline]
__wake_up_sync_key+0x11b/0x180 kernel/sched/wait.c:208
sock_def_readable+0x15b/0x280 net/core/sock.c:3308
__netlink_sendskb net/netlink/af_netlink.c:1258 [inline]
netlink_sendskb+0x97/0x130 net/netlink/af_netlink.c:1264
netlink_sendmsg+0x89e/0xbc0 net/netlink/af_netlink.c:1859
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg net/socket.c:730 [inline]
____sys_sendmsg+0x59b/0x970 net/socket.c:2519
___sys_sendmsg+0x21c/0x290 net/socket.c:2573
__sys_sendmsg net/socket.c:2602 [inline]
__do_sys_sendmsg net/socket.c:2611 [inline]
__se_sys_sendmsg+0x19e/0x270 net/socket.c:2609
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3071aa7407
RSP: 002b:00007ffe23bd2790 EFLAGS: 00000202 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f3072208880 RCX: 00007f3071aa7407
RDX: 0000000000000000 RSI: 00007ffe23bd27f0 RDI: 0000000000000004
RBP: 000055ef9769fb60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00000000000000a5
R13: 000055ef976189e0 R14: 0000000000000000 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 10628 jiffies! g9829 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R running task stack:27840 pid:16 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5244 [inline]
__schedule+0x10e9/0x40d0 kernel/sched/core.c:6561
schedule+0xb9/0x180 kernel/sched/core.c:6637
schedule_timeout+0x15c/0x280 kernel/time/timer.c:1965
rcu_gp_fqs_loop+0x2f2/0x1310 kernel/rcu/tree.c:1706
rcu_gp_kthread+0x95/0x380 kernel/rcu/tree.c:1905
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4403 Comm: syz.2.21 Not tainted 6.1.141-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__trace_hardirqs_on_caller kernel/locking/lockdep.c:4255 [inline]
RIP: 0010:lockdep_hardirqs_on_prepare+0x2e5/0x760 kernel/locking/lockdep.c:4315
Code: c1 7c 99 48 89 df e8 2a 97 6f 00 48 ba 00 00 00 00 00 fc ff df eb 85 48 8b 44 24 10 4c 8d b8 c0 0a 00 00 4c 89 f8 48 c1 e8 03 <0f> b6 04 10 84 c0 0f 85 3e 03 00 00 41 83 3f 00 0f 84 f5 00 00 00
RSP: 0018:ffffc9000498f960 EFLAGS: 00000802
RAX: 1ffff11004ceb158 RBX: ffff888026758ad8 RCX: baee13d3231b5700
RDX: dffffc0000000000 RSI: ffffffff8a6c0cc0 RDI: ffffffff8abf1360
RBP: ffffc9000498fa08 R08: dffffc0000000000 R09: ffffed1027fddd81
R10: ffffed1027fddd81 R11: 1ffff11027fddd80 R12: ffffffff812f2d90
R13: 0000000000000000 R14: 1ffff11004ceb15b R15: ffff888026758ac0
FS: 00007ffa604cb6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f786c0e56c0 CR3: 000000005785f000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
trace_hardirqs_on+0x34/0x40 kernel/trace/trace_preemptirq.c:49
__local_bh_enable_ip+0x12a/0x1b0 kernel/softirq.c:426
local_bh_enable include/linux/bottom_half.h:33 [inline]
fpregs_unlock arch/x86/include/asm/fpu/api.h:80 [inline]
copy_fpstate_to_sigframe+0x52d/0xcb0 arch/x86/kernel/fpu/signal.c:233
get_sigframe arch/x86/kernel/signal.c:297 [inline]
__setup_rt_frame arch/x86/kernel/signal.c:472 [inline]
setup_rt_frame arch/x86/kernel/signal.c:784 [inline]
handle_signal arch/x86/kernel/signal.c:828 [inline]
arch_do_signal_or_restart+0x610/0x1230 arch/x86/kernel/signal.c:873
exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7ffa5f58e929
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffa604cb0e8 EFLAGS: 00000246
RAX: fffffffffffffffc RBX: 00007ffa5f7b5fa8 RCX: 00007ffa5f58e929
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007ffa5f7b5fa8
RBP: 00007ffa5f7b5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffa5f7b5fac
R13: 0000000000000000 R14: 00007fff756b9850 R15: 00007fff756b9938
sched: RT throttling activated